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implement Cptree;
include "sys.m";
sys: Sys;
include "draw.m";
include "readdir.m";
readdir: Readdir;
include "cptree.m";
init()
{
sys = load Sys Sys->PATH;
readdir = load Readdir Readdir->PATH;
}
Context: adt {
progressch: chan of string;
warningch: chan of (string, chan of int);
finishedch: chan of string;
};
# recursively copy file/directory f into directory d;
# the name remains the same.
copyproc(f, d: string, progressch: chan of string,
warningch: chan of (string, chan of int),
finishedch: chan of string)
{
ctxt := ref Context(progressch, warningch, finishedch);
(fok, fstat) := sys->stat(f);
if (fok == -1)
error(ctxt, sys->sprint("cannot stat '%s': %r", f));
(dok, dstat) := sys->stat(d);
if (dok == -1)
error(ctxt, sys->sprint("cannot stat '%s': %r", d));
if ((dstat.mode & Sys->DMDIR) == 0)
error(ctxt, sys->sprint("'%s' is not a directory", d));
if (fstat.qid.path == dstat.qid.path)
error(ctxt, sys->sprint("'%s' and '%s' are identical", f, d));
c := d + "/" + fname(f);
(cok, cstat) := sys->stat(c);
if (cok == 0)
error(ctxt, sys->sprint("'%s' already exists", c));
rcopy(ctxt, f, ref fstat, c);
finishedch <-= nil;
}
rcopy(ctxt: ref Context, src: string, srcstat: ref Sys->Dir, dst: string)
{
omode := Sys->OWRITE;
perm := srcstat.mode;
if (perm & Sys->DMDIR) {
omode = Sys->OREAD;
perm |= 8r300;
}
dstfd := sys->create(dst, omode, perm);
if (dstfd == nil) {
warning(ctxt, sys->sprint("cannot create '%s': %r", dst));
return;
}
if (srcstat.mode & Sys->DMDIR) {
(entries, n) := readdir->init(src, Readdir->NAME | Readdir->COMPACT);
if (n == -1)
warning(ctxt, sys->sprint("cannot read dir '%s': %r", src));
for (i := 0; i < len entries; i++) {
e := entries[i];
rcopy(ctxt, src + "/" + e.name, e, dst + "/" + e.name);
}
if (perm != srcstat.mode) {
(ok, nil) := sys->fstat(dstfd);
if (ok != -1) {
dststat := sys->nulldir;
dststat.mode = srcstat.mode;
sys->fwstat(dstfd, dststat);
}
}
} else {
srcfd := sys->open(src, Sys->OREAD);
if (srcfd == nil) {
sys->remove(dst);
warning(ctxt, sys->sprint("cannot open '%s': %r", src));
return;
}
ctxt.progressch <-= "copying " + src;
buf := array[Sys->ATOMICIO] of byte;
while ((n := sys->read(srcfd, buf, len buf)) > 0) {
if (sys->write(dstfd, buf, n) != n) {
sys->remove(dst);
warning(ctxt, sys->sprint("error writing '%s': %r", dst));
return;
}
}
if (n == -1) {
sys->remove(dst);
warning(ctxt, sys->sprint("error reading '%s': %r", src));
return;
}
}
}
warning(ctxt: ref Context, msg: string)
{
r := chan of int;
ctxt.warningch <-= (msg, r);
if (!<-r)
exit;
}
error(ctxt: ref Context, msg: string)
{
ctxt.finishedch <-= msg;
exit;
}
fname(f: string): string
{
f = cleanname(f);
for (i := len f - 1; i >= 0; i--)
if (f[i] == '/')
break;
return f[i+1:];
}
cleanname(s: string): string
{
t := "";
i := 0;
while (i < len s)
if ((t[len t] = s[i++]) == '/')
while (i < len s && s[i] == '/')
i++;
if (len t > 1 && t[len t - 1] == '/')
t = t[0:len t - 1];
return t;
}
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